JLUS Background Report sj_br_report_sm - Page 324

Page 5.23‐2
– within 5,000 feet of a public use heliport which exceeds a 25:1 surface .
Any highway , railroad , or other traverse way whose prescribed adjusted height would exceed the above noted standards .
When requested by the FAA :
– Any construction or alteration located on a public use airport or heliport regardless of height or location .
Part 77 also identifies the height at which an object may be considered an obstruction at a designated distance :
§ 77.17‐ Obstruction standards .
( a ) An existing object , including a mobile object , is , and a future object would be an obstruction to air navigation if it is of greater height than any of the following heights or surfaces :
( 1 ) A height of 499 feet above ground level at the site of the object .
( 2 ) A height that is 200 feet above ground level or above the established airport elevation , whichever is higher , within three nautical miles of the established reference point of an airport , excluding heliports , with its longest runway more than 3,200 feet in actual length , and that height increases in the proportion of 100 feet for each additional nautical mile from the airport up to a maximum of 499 feet .
( 3 ) A height within a terminal obstacle clearance area , including an initial approach segment , a departure area , and a circling approach area , which would result in the vertical distance between any point on the object and an established minimum instrument flight altitude with segment to be less than the required ob
( 4 ) A height within an en route obstacle including turn and termination areas , of approved off‐airway route , that would in minimum obstacle clearance altitude .
( 5 ) The surface of a takeoff and landing any imaginary surface established unde 77.23 . However , no part of the takeoff o will be considered an obstruction .
( b ) Except for traverse ways on or near a operative ground traffic control service f airport traffic control tower or by the air and coordinated with the air traffic cont standards of paragraph ( a ) of this sectio ways used or to be used for the passage only after the heights of these traverse w by :
( 1 ) 17 feet for an Interstate Highway tha National System of Military and Intersta overcrossings are designed for a minimu distance .
( 2 ) 15 feet for any other public roadway
( 3 ) 10 feet or the height of the highest m would normally traverse the road , which private road .
( 4 ) 23 feet for a railroad .
( 5 ) For a waterway or any other traverse mentioned , an amount equal to the heig mobile object that would normally trave
– within 5,000 feet of a public use heliport which exceeds a  25:1 surface.   minimum instrument flight altitude within that area or  segment to be less than the required obstacle clearance.   Any highway, railroad, or other traverse way whose  prescribed adjusted height would exceed the above noted  standards.  (4)  A height within an en route obstacle clearance area,  including turn and termination areas, of a Federal Airway or  approved off‐airway route, that would increase the  minimum obstacle clearance altitude.   When requested by the FAA:  (5)  The surface of a takeoff and landing area of an airport or  any imaginary surface established under § 77.19, 77.21, or  77.23. However, no part of the takeoff or landing area itself  will be considered an obstruction.   – Any construction or alteration located on a public use  airport or heliport regardless of height or location.  Part 77 also identifies the height at which an object may be considered an  obstruction at a designated distance:   (b) Except for traverse ways on or near an airport with an  operative ground traffic control service furnished by an  airport traffic control tower or by the airport management  and coordinated with the air traffic control service, the  standards of paragraph (a) of this section apply to traverse  ways used or to be used for the passage of mobile objects  only after the heights of these traverse ways are increased  by:  §77.17‐ Obstruction standards.  (a)  An existing object, including a mobile object, is, and a  future object would be an obstruction to air navigation if it is  of greater height than any of the following heights or  surfaces:  (1)  A height of 499 feet above ground level at the site of the  object.  (1) 17 feet for an Interstate Highway that is part of the  National System of Military and Interstate Highways where  overcrossings are designed for a minimum of 17 feet vertical  distance.   (2)  A height that is 200 feet above ground level or above t p\X\Y0Z\ܝ0[]][ۋ0X]\\Y\0][Yp]]X[0Z[\ٰp\X\Y0Y\[p[0ٰ[Z\ܝ 0^Y[[\ܝ0]0]ۙ\0[^p[ܙp[ 0Y]0[XX[0[ 0[0]0ZY0[ܙX\\[pܝ[۰ٰ L 0Y]0ܰXX0Y][ۘ[0]]X[0Z[pppZ\ܝ0\0pX^[][pٰ NpY]  p MpY]0ܰ[p\XXY^K0 p L0Y]0ܰpZY0ٰpY\0[ؚ[pؚX0]0[0ܛX[p]\ppY 0X]\\ܙX]\0ܰp]]pY 0 p0pZY0][p\Z[[0؜XpX\[p\XK0[Y[[[]X[0\X0YY[ 0p\\\p\XK0[0p\[\X0\XK0X0[0\[0[p\X[0\[p]Y[[p[0۰pؚX0[0[\X\Y0Yp K$  p Y]0ܰpZ[Y 0 Jpܰp]\^pܰ[p\]\p^p0][\pY[[ۙY 0[[[[0\]X[0pZY0ٰpY\0[ؚ[pؚX0]0[0ܛX[p]\p] Xܛ[0\ܝ0